路面融雪装置の設計熱負荷 第3報：サービス水準と消費熱の総合評価指標の提案

上村 靖司, 善哉 広大

doi:10.5331/seppyo.81.6_269

To evaluate the overall performance of road surface snow-melting devices, two indexes, one focusing on service level and the other focusing on heat consumption, are proposed. For the service level index, the “snow remaining time ratio”，ϕ，is defined as the ratio of the total snow remaining time on the surface to the total snowfall time during a winter season. As the overall heat consumption index, the “input heat ratio”，E, is defined as the ratio of the total heat output of the snow melting device to the total heat load created by snowfall in a winter season. In our study, a snowmelt simulation was performed by inputting the weather data of five winters in Japan at six representative points into the heat balance model proposed in our previous report. Three types of operation methods (snowfall detection control (FC), snow cover detection control (CC), and hybrid control (HC)), as well as two heat output control types (constant and variable) were simulated, and a ϕ-E diagram was created for each model. The ϕ-E diagram, which is useful for determining a balance between service levels and the operating costs, can also provide a guide of the initial setup costs. A comparison between the three operation methods revealed the following points. The high heat output of the FC method provides high service levels that rarely leave residual snow when the snowfall duration is short. In contrast, in the CC method, heat consumption is less than half that of FC, but there is a limit to the service level that can be achieved via that method. In the case of the HC method, high service can be realized with low heat output and a heat consumption that is intermediate between the FC and CC methods. Meanwhile, we found that variable heat output is effective in terms of both service and heat consumption levels, but it does not lead to dramatic improvements despite higher initial costs. In particular, combining variable heat output with the CC method does not produce any notable advantages.

路面融雪装置の設計熱負荷第3報：サービス水準と消費熱の総合評価指標の提案

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